水みずに流ながす

expression, godan verb (-su)

forgive and forget; let bygones be bygones; wipe the slate clean

Idiomatic expression meaning to let past troubles or grudges go, as if washing them away with water. Often used when reconciling or moving on from a conflict.

• 昔むかしのことは水みずに流ながして、仲なか直なおりしよう。

  Let's forgive and forget the past and make up.

• 彼かれは過か去この失しっ敗ぱいを水みずに流ながして、新あたらしい仕し事ごとに集しゅう中ちゅうした。

  He let bygones be bygones and focused on his new job.